LLVM 3.3 was released in 2013 with improved x86 and ARM cost models, Clang C++11 / C11 support improvements, experimental support for the AMD R600 GPU LLVM back-end, and numerous other enhancements.

LLVM 3.3 Articles & Reviews

LLVM Clang 3.4 Already Has Some Performance Changes   Software   2013-06-27
GCC 4.8.0 vs. LLVM Clang 3.3 Compiler Performance   Software   2013-05-25
AMD Radeon R600 GPU LLVM 3.3 Back-End Testing   Display Drivers   2013-05-14
LLVM 3.3 To Introduce SLP Vectorizer   Software   2013-05-07
Running Mesa 9.2-devel + LLVM 3.3 SVN With The R600 Back-End   Display Drivers   2013-02-26

LLVM 3.3 Linux & Open-Source News

Intel's Beignet Lands LLVM 4.0 Backend Support   Intel   2017-04-13
DragonEgg Starts Cracking In LLVM   LLVM   2015-04-29
LLVM Is At Nearly 2.5 Million Lines Of Code   LLVM   2013-12-26
LLVM 3.4 Isn't Out Yet, But It Will Be Exciting   LLVM   2013-12-23
Features Coming For The LLVM 3.4 Compiler Stack   LLVM   2013-10-27
Mesa 9.2.2 Is Now Available   Mesa   2013-10-19
LLVM/Clang Is Advancing To Build The Linux Kernel   Linux Kernel   2013-10-16
LLVM Picks Up Support For ARM's Cortex-A57   LLVM   2013-10-15
LLVM Clang 3.4 SVN Compiler Tests With Core-AVX2   LLVM   2013-09-22
RadeonSI / GLAMOR Support Still M.I.A. From Ubuntu 13.10   Radeon   2013-09-12
An LLVM 3.3.1 Point Release Is Likely To Come   AMD   2013-08-24
Gallium3D LLVMpipe Still Needs A Very Fast CPU   Mesa   2013-08-23
Performance Overview Of Mesa 9.2   Mesa   2013-08-21
Mesa 9.1.6 Provides Stable Driver Bug-Fixes   Mesa   2013-08-02
LLVM Clang 3.4 Enables SLP Vectorizer By Default   LLVM   2013-08-01
Apple, Google Agree On More SLP Vectorization   Programming   2013-07-28
New LLVM Clang Compiler Benchmarks: 3.2, 3.3, 3.4 SVN   LLVM   2013-07-15
LLVM May Enable The SLP Vectorizer By Default   LLVM   2013-07-14
R600 Gallium3D LLVM Compiler Back-End Benchmarks   Mesa   2013-07-14
Gallium3D's LLVMpipe Is Much Faster With Mesa 9.2   Mesa   2013-07-10
LLDB 3.3 Grows In Use For Linux Developers   LLVM   2013-06-29
AMD HD 7000 "RadeonSI" Runs Well With Fedora 19   Radeon   2013-06-27
LLVM Clang 3.3, Early Clang 3.4 Benchmarks   AMD   2013-06-23
LLVM 3.3 Officially Released   LLVM   2013-06-18
LLVM/Clang Now Uses Loop Vectorizer At New Levels   LLVM   2013-06-17
LLVM / Clang 3.3 Is Running Late, But It's Good   LLVM   2013-06-09
An Important Radeon R600 Change In LLVM 3.4   LLVM   2013-06-07
LLVM May Expand Its Use Of The Loop Vectorizer   LLVM   2013-06-06
Gaming, Linux Desktop Advances For May 2013   Phoronix   2013-05-31
The Best Features Of LLVM / Clang 3.3   LLVM   2013-05-26
LLVM Clang 3.3 RC2 Is Ready For Testing   LLVM   2013-05-24
JADE: An LLVM-Based Video Decoder For MPEG RVC   LLVM   2013-05-17
LLVM 3.3 Release Candidate 1 Now Available   LLVM   2013-05-08
LLVM/Clang 3.3 Branched With Many New Features   LLVM   2013-05-07
Intel Is Nearing OpenMP Support In LLVM/Clang   LLVM   2013-05-06
GLSL 1.30 Support For AMD RadeonSI Driver With LLVM   Radeon   2013-05-06
LLVM 3.3 Planned As A Phoronix Birthday Present   Phoronix   2013-05-03
Gears On Gallium Still Grinding The Latest Mesa   Operating Systems   2013-04-24
LLVM's Clang Compiler Is Now C++11 Feature Complete   LLVM   2013-04-19
Talk Of Doing Point Releases For LLVM   AMD   2013-04-06
LLVM/Clang 3.3 Planned For Release In June   LLVM   2013-04-02
LLVM 3.3 Picks Up More Support For Intel AVX2   LLVM   2013-03-29
Linaro Developers Plan ARM LLVM Improvements   LLVM   2013-03-12
A Few More Games Now Work With "RadeonSI" Driver   Linux Gaming   2013-03-07
Scheduler Code Merged For AMD R600 LLVM Back-End   AMD   2013-03-06
Tilera Publishes TILE-Gx CPU Back-End To LLVM   LLVM   2013-03-02
Gallium3D LLVMpipe Driver Shows Progress   Mesa   2013-02-28
Initial Benchmarks Of The LLVM/Clang 3.3 Compiler   LLVM   2013-02-19
AMD R600 LLVM GPU Back-End Gets Better   AMD   2013-02-15
LLVM 3.3 Improves Its Loop Vectorizer   LLVM   2013-02-15
Indirect Addressing Merged In LLVM R600 Back-End   AMD   2013-02-07
64-bit ARM (AArch64) Support Merged Into LLVM   LLVM   2013-01-31
Running OpenCL On The GPU With Gallium3D   Mesa   2013-01-23
R600 LLVM Back-End Gets Indirect Addressing Support   Mesa   2013-01-22
Radeon LLVM GPU Back-End Stripped From Mesa   Radeon   2013-01-07
What Features LLVM/Clang 3.2 Bring To The Table   LLVM   2012-12-23
NVIDIA's CUDA/OpenCL PTX Back-End In LLVM 3.2   LLVM   2012-12-16
Looping Through LLVM's New Loop Vectorizer   LLVM   2012-12-08